Method for printing on housings

Abstract

A printing method comprises: providing a metal housing; printing a first ink coating on the metal housing and drying the first ink coating at a temperature of about 100-150° C. for about 15-25 minutes, the first ink coating including epoxy resin; printing a second ink coating on the first ink coating and drying the second ink coating at a temperature of about 100-150° C. for about 15-25 minutes, the second ink coating including epoxy resin; and printing a third ink coating on the second ink coating and drying the third ink coating at a temperature of about 100-150° C. for about 60-120 minutes, the third ink coating including epoxy resin.

1 . A printing method, comprising:
 providing a metal housing;   printing a first ink coating on the metal housing and drying the first ink coating at a temperature of about 100-150° C. for about 15-25 minutes, the first ink coating including epoxy resin;   printing a second ink coating on the first ink coating and drying the second ink coating at a temperature of about 100-150° C. for about 15-25 minutes, the second ink coating including epoxy resin; and   printing a third ink coating on the second ink coating and drying the third ink coating at a temperature of about 100-150° C. for about 60-120 minutes, the third ink coating including epoxy resin.   
     
     
         2 . The method as claimed in  claim 1 , wherein the metal housing is made of aluminum or aluminum alloy. 
     
     
         3 . The method as claimed in  claim 1 , wherein the metal housing is formed with an anode oxide film thereon. 
     
     
         4 . The method as claimed in  claim 1 , wherein drying the first ink coating is carried out at a temperature of about 118-122° C. for about 20 minutes; drying the second ink coating is carried out at a temperature of about 118-122° C. for about 20 minutes; drying the third ink coating is carried out at a temperature of about 118-122° C. for about 65-75 minutes. 
     
     
         5 . The method as claimed in  claim 1 , wherein printing the first ink coating is carried out by using an ink that contains a first major agent(s), a second major agent(s), a firming agent(s), and a diluting agent(s); the ink is made by blending the first major agent(s) and the firming agent(s) at a mass ratio of about 7:3 to obtain a first middle ink; then mixing the second major agent(s) into the first middle ink to obtain a mixed ink, the second major agent(s) is in a mass percent of about 30% of the mixed ink; and at last, employing the diluting agent(s) into the mixed ink, the diluting agent(s) is in a mass percent of about 2-8% of the mixed ink. 
     
     
         6 . The method as claimed in  claim 5 , wherein the first major agent(s) contains an epoxy component in a mass percent of about 35-40% of the first major agent(s). 
     
     
         7 . The method as claimed in  claim 5 , wherein the second major agent(s) is a transparent varnish; the second major agent(s) contains an epoxy component in a mass percent of about 60-80% of the second major agent(s). 
     
     
         8 . The method as claimed in  claim 5 , wherein the firming agent(s) contains a polyamide resin component in a mass percent of about 55-65% of the firming agent(s). 
     
     
         9 . The method as claimed in  claim 5 , wherein printing the second ink coating is carried out by using an ink that contains a second major agent(s), a firming agent(s), and a diluting agent(s); the ink used for printing the second ink coating is made by blending the second major agent(s) and the firming agent(s) at a mass ratio of about 7:3 to obtain a second middle ink first; then employing the diluting agent(s) into the second middle ink, the diluting agent(s) is in a mass percent of about 2-8% of the second middle ink. 
     
     
         10 . The method as claimed in  claim 9 , wherein printing the third ink coating is carried out by using the same type of ink used in forming the second ink coating. 
     
     
         11 . A printing method, comprising:
 providing a metal housing;   printing a first ink coating on the metal housing and drying the first ink coating at a temperature of about 100-150° C. for about 15-25 minutes, the first ink coating including epoxy resin; and   printing a second ink coating on the first ink coating and drying the second ink coating at a temperature of about 100-150° C. for about 15-25 minutes, the second ink coating including epoxy resin.